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Crystal-state and non-crystal-state structure and size adjustable nano pure-samarium preparing method

An amorphous and dimensional technology, which is used in the preparation of nano-pure samarium materials, can solve the problems of lack of mechanical properties of rare earth elements and inability to realize size-level adjustable nano-block materials.

Inactive Publication Date: 2007-04-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the extremely high chemical activity of rare earth elements and the resulting stringent requirements for preparation technology, there is currently a lack of important basic research on the chemical properties, physical properties, thermodynamic properties, and mechanical properties of rare earth elements at the nanoscale. The data are rarely reported, but the understanding of the basic properties of rare earth elements at the nanoscale is the key to the research and development of new nanoscale rare earth materials
[0003] The study of the nanoscale effect on the structure and properties of rare earth materials requires nanocrystalline bulk materials of multiple size levels, and several existing methods for the development of nanocrystalline bulk materials cannot achieve nanoscale bulk materials with adjustable size levels. At present, there are no reports on the preparation of nano-bulk materials with adjustable crystalline and amorphous structures at home and abroad.

Method used

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  • Crystal-state and non-crystal-state structure and size adjustable nano pure-samarium preparing method
  • Crystal-state and non-crystal-state structure and size adjustable nano pure-samarium preparing method
  • Crystal-state and non-crystal-state structure and size adjustable nano pure-samarium preparing method

Examples

Experimental program
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Effect test

example 1

[0021] Example 1. Pure samarium nanoparticles (average particle size is 70 nanometers) are packed into a graphite mold under the protection of an inert gas, and sent into the sintering chamber of a spark plasma sintering system filled with an inert gas. Press molding, the pressure is 30MPa. The specific sintering process parameters are: sintering temperature 280°C, sintering pressure 50MPa, sintering heating rate 50°C / min, the amorphous nano-bulk material of pure samarium is prepared (see Figure 1 and Figure 2 for the microstructure, and see Figure 2 for the material characterization parameters. Table 1).

example 2

[0022] Example 2. Pure samarium nanoparticles (average particle size is 60 nanometers) are packed into a graphite mold under the protection of an inert gas, and sent into the sintering chamber of a spark plasma sintering system filled with an inert gas. Press molding, the pressure is 50MPa. The specific sintering process parameters are: sintering temperature 240°C, sintering pressure 50MPa, sintering heating rate 30°C / min, the amorphous nano-block material of pure samarium is prepared (microstructure characteristics are similar to those in Figure 1 and Figure 2, material characterization The parameters are shown in Table 1).

example 3

[0023] Example 3. Pure samarium nanoparticles (average particle diameter is 55 nanometers) are packed into a graphite mold under the protection of an inert gas, and sent into the sintering chamber of a spark plasma sintering system filled with an inert gas. Press molding, the pressure is 50MPa. The specific sintering process parameters are: sintering temperature 350°C, sintering pressure 50MPa, sintering heating rate 50°C / min, in-situ pressurization and heat preservation for 2min after densification, to prepare a crystalline and amorphous nano-composite structure of pure samarium Bulk material (see Figure 3 for the microstructure, Figure 4 for the characterization of the crystal phase structure, and Table 1 for the material characterization parameters).

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Abstract

This invention relates to nm material structure scientific and preparation field including the following steps: taking elementary Sm of 99.5w% as the raw material to prepare pure Sm nm particles with the current vapor-condensation method protected by inert atmosphere then to be put into a graphite die and sent to a discharge plasma system sinter chamber full of inert gas to be pressed to formation with 30~100Mpa pressure. The following parameters are applied for the sinter: the end state sintering temperature 150-350deg.C, rising rate: 30-50deg.C / min sinter pressure 50-100Mpa, thermal insulation 0-5min. This invention can get pure nm Sm material with adjustable sizes in three crystal phases.

Description

technical field [0001] The invention relates to a preparation method of nano-pure samarium material whose crystalline and amorphous structure and size can be adjusted, and belongs to the field of nano-material structure science and preparation technology. Background technique [0002] Today, the research and development of new high-performance nanomaterials is a recognized research hotspot and a vital research direction in the field of materials science and engineering. The research on nano-rare earth materials is the focus of strategic significance. Rare earth elements have unique 4f electronic structure, high atomic magnetic moment, rich electronic energy levels and other characteristics, which make them exhibit very unique physical and chemical properties, and have attracted the attention of scientists all over the world. After the rare earth is nanosized, due to the high-concentration grain boundary characteristics and small size effect, the rare earth elements will sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C45/00B22F3/00B22F9/02
Inventor 宋晓艳张久兴李尔东岳明卢年端
Owner BEIJING UNIV OF TECH